| 单词 | caesium |
| 例句 | This is because more radioactive caesium from Chernobyl will seep further into the soil, further contaminating the truffles. Nuclear weapons testing cause of radioactivity in wild boars, study says 2023-08-30T04:00:00Z It contains the caesium 137 ceramic source, commonly used in radiation gauges, which emits dangerous amounts of radiation, equivalent of receiving 10 X-rays in an hour. Radioactive capsule that fell off truck found in Australia 2023-02-01T05:00:00Z The caesium 137 ceramic source, commonly used in radiation gauges, emits dangerous amounts of radiation, equivalent of receiving 10 X-rays in an hour. Australia mining company sorry for losing radioactive device 2023-01-29T05:00:00Z A bomb using radioactive caesium from a misplaced or stolen medical device might require the evacuation of an area of several city blocks, making it unsafe for decades. Explainer: What is a dirty bomb and why is Russia talking about one now? 2022-10-25T04:00:00Z The radioactive strontium, caesium and plutonium mainly affected Ukraine and neighboring Belarus, as well as parts of Russia and Europe. Explainer: Why Russia and Ukraine are fighting for Chernobyl disaster site 2022-02-25T05:00:00Z Previous state-of-the-art caesium clocks are based on measuring microwaves emitted as the atoms transition between two energy states—a process triggered by dropping clouds of atoms and bombarding them with microwaves. COVID Advances Win $3-million Breakthrough Prizes 2021-09-09T04:00:00Z The iodine nightmare is of me hurtling through the darkness of space beyond the orbit of Mars, solar cells degraded or fractured or misoriented, caesium cold and useless without power for the Hall-effect thruster. Halogen nightmares 2020-09-01T04:00:00Z Today, atomic transitions are the foundation on which all time measurements are built: a transition in the caesium-133 atom provides a reference value that underpins the International System of Units definition of the second. Exotic helium atom lit up 2020-05-05T04:00:00Z In the hours, days, and weeks after the explosion, radioactive elements including plutonium, iodine, strontium, and caesium contaminated a region of roughly 150,000 square kilometers in Belarus, Russia, and Ukraine. What Is Chernobyl Like Today? 2020-01-23T05:00:00Z Instead – check this out – it can be fixed just by knowing the frequency of vibration of an atom of caesium. The science stories that shaped 2019 2019-12-22T05:00:00Z But caesium fountain clocks rely on a technology that dates back to the 1950s. How to build a clock that detects gravity 2019-08-04T04:00:00Z Heldal said that the radiation levels are not dangerously high, citing the permitted limit for radioactive caesium in food. Scientists discover radiation leak '100,000 times normal level' from Russian nuclear sub wreck 2019-07-11T04:00:00Z A sample showed radioactive caesium leaking from a ventilation pipe in the Komsomolets. Norway finds big radiation leak from Russian sub 2019-07-11T04:00:00Z The early predictions of caesium being washed from upland soils proved optimistic. Chernobyl’s cover-up is a warning for our nuclear future | Kate Brown 2019-04-04T04:00:00Z Another caesium atom is attracted to this concentration of lithium atoms, resulting in an attractive interaction between the caesium atoms that is mediated by the lithium atoms. New interactions seen in an ultracold gas 2019-04-02T04:00:00Z He introduced the relatively small alkali metals, rubidium and caesium, to the mix, which produced solar cells that maintain performance at high temperatures for almost 21 consecutive days. Japan’s global connectors 2019-03-19T04:00:00Z Fission products, such as radioactive caesium, strontium, xenon and krypton, must be still lingering in the tunnel. Why North Korea's denuclearization plan doesn't convince this nuclear expert 2018-05-22T04:00:00Z The ever-shifting suite of technologies used at the site produced uniquely toxic brews that include radioactive caesium, strontium, americium and residual plutonium; salts; heavy metals; and myriad industrial chemicals. How the United States plans to trap its biggest stash of nuclear-weapons waste in glass 2017-10-09T04:00:00Z Researchers added months, then years, to their predictions of how long the radioactive caesium would linger in the environment. Chernobyl’s cover-up is a warning for our nuclear future | Kate Brown 2019-04-04T04:00:00Z The reason for this change is that the energy of the caesium atoms was shifted by the direct interaction between the caesium and lithium atoms. New interactions seen in an ultracold gas 2019-04-02T04:00:00Z GPS satellites typically house four atomic clocks, made from caesium or rubidium. Tick tock: The importance of knowing the right time - BBC News 2017-04-02T04:00:00Z Efforts to secure nuclear materials are often focused on this ‘insider threat’, as well as the disposal and recycling of irradiators, which can contain enough caesium to pose a hazard for centuries. Biologists struggle with push to eliminate radioactive caesium in labs 2016-05-09T04:00:00Z Of course they offer no protection against other radioactive elements such as caesium-137. All Belgians to be given iodine pills for nuclear safety - BBC News 2016-04-28T04:00:00Z In the 1950s, British officials detected harmful levels of radioactive caesium in imported Minnesota wheat. Chernobyl’s cover-up is a warning for our nuclear future | Kate Brown 2019-04-04T04:00:00Z By carefully analysing their experimental data, DeSalvo and colleagues concluded that this effect was caused by an attractive interaction between the caesium atoms that was mediated by the lithium gas. New interactions seen in an ultracold gas 2019-04-02T04:00:00Z The agency said Monday that the men were arrested while trying to sell an unspecified amount of caesium-137 for $100,000. Georgia's security agency arrests 3 men suspected of peddling radioactive substance 2016-01-11T05:00:00Z Her research has revealed that immune cells called B lymphocytes recovered more slowly in mice treated with an X-ray irradiator than in those exposed to caesium. Biologists struggle with push to eliminate radioactive caesium in labs 2016-05-09T04:00:00Z The rack holds a high-precision, caesium atomic clock—the most accurate sort on the planet—and two other digital timepieces, called “grandmaster clocks”, that work alongside it. Stamp collectors 2015-10-29T04:00:00Z The most recent case was in February when undercover agents were offered a large amount of radioactive caesium from a smuggler who specifically sought a buyer from Islamic State, the report said. FBI foils plot to sell nuclear material in Moldova 2015-10-07T04:00:00Z The authors tuned the direct interaction between the caesium atoms to be only very weakly repulsive so that the attractive mediated interaction was comparatively stronger. New interactions seen in an ultracold gas 2019-04-02T04:00:00Z A sample vial of less-radioactive caesium 135 was produced and police pounced, arresting the man and two others. Nuclear smuggling deals 'thwarted' in Moldova - BBC News 2015-10-06T04:00:00Z For nuclear regulators, the risk posed by caesium is clear. Biologists struggle with push to eliminate radioactive caesium in labs 2016-05-09T04:00:00Z To do so, a caesium atomic clock is synchronised with the main standard at the NPL and then carried to the place where it will be installed. Stamp collectors 2015-10-29T04:00:00Z Their experiment works by dropping caesium atoms above an aluminium sphere. Two Steps Closer to the Search for Dark Matter and Dark Energy 2015-08-21T04:00:00Z So the main function of the satellite test is to build confidence in optical clocks and show that they perform at least as well as existing caesium clocks, say researchers. Hyper-precise atomic clocks face off to redefine time 2015-06-01T04:00:00Z Police said the radioactive material was likely to be caesium but the levels were too low to be harmful to human health. Japan radioactive drone: Tokyo police arrest man - BBC News 2015-04-25T04:00:00Z Caesium irradiators, which have long been used to eliminate pathogens in supplies of blood as well as for research applications, rely on small capsules of radioactive caesium chloride encased in a lead-covered box. Biologists struggle with push to eliminate radioactive caesium in labs 2016-05-09T04:00:00Z And if the fibre connection bringing the pips should be cut, the caesium clock takes over until a connection is restored. Stamp collectors 2015-10-29T04:00:00Z Tests found it was carrying a small amount of radioactive caesium, reported Kyodo news agency. 'High level' of radiation detected in Tokyo park - BBC News 2015-04-24T04:00:00Z Even if the clocks pass this later test, usurping the caesium clock to create a more precise definition of the second will not be easy. Hyper-precise atomic clocks face off to redefine time 2015-06-01T04:00:00Z Currently, UTC is set using atomic clocks that measure the vibrational frequency of the element caesium, although these are only accurate in the region of one second in hundreds of millions of years. The most accurate clock ever built only loses one second every 15 billion years 2015-04-22T04:00:00Z The US government fears that the radioactive caesium could be stolen to make a ‘dirty’ bomb. Biologists struggle with push to eliminate radioactive caesium in labs 2016-05-09T04:00:00Z The government also instigated an extensive monitoring campaign, sampling foods before they hit the market for levels of radioactive elements such as caesium-137, and banning producers or areas that exceeded regulatory limits. Fukushima data show rise and fall in food radioactivity 2015-02-26T05:00:00Z That's because caesium was always a compromise element when it came to timekeeping. The element that redefined time 2014-10-03T04:00:00Z Grimm and his colleagues observed an excited Efimov state of caesium atoms. Exotic atomic threesomes explained 2014-05-22T04:00:00Z Clocks based on caesium are approaching their performance limit; later clocks will probably use atoms that vibrate at higher frequencies, making them more accurate. Seven days: 4–10 April 2014 2014-04-09T17:20:15.453Z Researchers have used the caesium devices for decades, to study everything from immunotherapy to cancer treatment, and some fear that switching to X-ray irradiators will affect their results. Biologists struggle with push to eliminate radioactive caesium in labs 2016-05-09T04:00:00Z And by June of last year, they were detecting quantities of radioactive caesium-137 and 134 along the sampling line’s entire length. Scientists track Fukushima plume 2014-02-25T11:36:47Z GPS satellites carry synchronised caesium clocks that enable them collectively to triangulate your position and work out where on earth you are. The element that redefined time 2014-10-03T04:00:00Z One of the most accurate in the world, the NPL clock is tuned to the regular bursts of light emitted by caesium atoms when they are excited by microwaves. A question of time 2014-01-22T18:20:04.418Z Some created as a result of nuclear fission, such as strontium and caesium, are unstable and emit harmful radiation until they decay to a stable state. Soviets performed nuclear blasts at Siberian oilfield to be shared with China 2013-10-25T10:29:24Z The agency is negotiating with the Mount Sinai Health System in New York City to support a new round of studies that will compare X-ray and caesium irradiators. Biologists struggle with push to eliminate radioactive caesium in labs 2016-05-09T04:00:00Z Their transistor is set to ‘on’ by default, allowing a beam of light to sail through the transparent caesium cloud unmolested. Light flips transistor switch 2013-06-12T17:50:24.017Z In 1971 scientists sent three caesium clocks around the world on commercial airliners. The element that redefined time 2014-10-03T04:00:00Z The oil services firm Schlumberger also "temporarily lost" caesium-137 radioactive materials on a North Sea platform, while Southampton General hospital could not locate an "unsealed source" of iodine-131 in February last year. Radioactive materials lost in more than 30 incidents over past decade 2013-05-05T18:00:47Z Fisher’s team confirmed the presence of both caesium isotopes in bluefin tuna arriving from Japan — although the levels pose no health risk to humans. Tsunami triggers invasion concerns 2013-03-06T18:20:22.950Z Its monthly records detail the levels of radioactive caesium found in fish and other seafood products from shortly after the March 2011 Tohoku earthquake and tsunami - the double disaster that triggered the Fukushima crisis. Fukushima fish still contaminated 2012-10-25T18:36:48Z That was despite repeated tests of his products in which no radioactive caesium was detected. Lessons learned: Japan's recovery in the spotlight 2012-10-08T21:39:02Z When they returned they were compared with caesium clocks that had stayed at home in the United States Naval Observatory. The element that redefined time 2014-10-03T04:00:00Z The measured concentrations were about 10 times the total caesium radioactivity seen in tuna specimens taken from before the accident. Tuna record Fukushima pollution 2012-05-29T02:45:50Z Volatile radioactive chemicals, notably iodine-131 and caesium-137, began to stream into the air and sea. Nuclear crisis: Fukushima's legacy of fear 2012-03-07T18:20:26.903Z "So if you add both caesium isotopes and radioactive silver - they represented only one-fifth or one-sixth of the radioactivity contributable to potassium-40." Cruise finds Fukushima pollution 2012-02-22T23:05:35Z This is not the first example of such theft: for instance, looters stole caesium and cobalt radioactive sources from a nuclear centre in Baghdad in 2003, after the US-led invasion of Iraq. Seven days: 20?26 January 2012 2012-01-25T18:50:15.787Z Well, thanks to caesium the entire world now keeps time so accurately that it has forced us to reconsider what time really is. The element that redefined time 2014-10-03T04:00:00Z The team was surprised to find the contamination in every sample All the fish examined in the study showed elevated levels of radioactive caesium - the isotopes 134 and 137. Tuna record Fukushima pollution 2012-05-29T02:45:50Z Fukushima prefecture is among the largest rice producers in Japan, but last year the agriculture ministry considered completely prohibiting cultivation where crops contained more than 100 Bqkg of caesium. Nuclear crisis: Fukushima's legacy of fear 2012-03-07T18:20:26.903Z Reaves used a caesium chloride gradient to separate the cells' DNA into fractions of varying densities, then used a mass spectrometer to identify the elements present in each fraction of DNA. Study Fails to Confirm Existence of Arsenic-Based Life 2012-01-23T15:45:00.257Z His discoveries, which won him the Nobel prize, led to the caesium atomic clock and the hydrogen maser. Seven days: 4?10 November 2011 2011-11-15T17:20:24.403Z Louis Essen chose caesium, explains Szymaniec, because the frequency of its transition was at the limit of what the technology of his day could measure. The element that redefined time 2014-10-03T04:00:00Z The new analysis also claims that the spent fuel being stored in the unit 4 pool emitted copious quantities of caesium-137. Fukushima Nuclear Planet Released Far More Radiation than Government Said 2011-10-25T21:45:00.250Z Corrosive salt water has been replaced with fresh water that is passed through a filtration system to remove radioactive caesium before being recycled back into the cores. Nuclear crisis: Fukushima's legacy of fear 2012-03-07T18:20:26.903Z It takes 30 years for caesium 137 to decay by half. Japan cities face growing radioactive ash, troubles ahead 2011-10-17T04:25:08Z It comes after 136 cows were found to have consumed feed affected by radioactive caesium. Japan plans to ban Fukushima beef 2011-07-18T06:42:36Z The sun was dethroned, and caesium took its place - though one wonders how long it will be before strontium or ytterbium knocks caesium off its perch. The element that redefined time 2014-10-03T04:00:00Z The teams at the plant suspect the radiation rise may be linked to sludge flowing into the machinery intended to absorb caesium or the pipes surrounding it. Radiation stops Japanese clean-up 2011-06-18T06:34:32Z For example, scouring caesium from roads with a high-pressure water jet was thought to be insufficient because contaminated water would simply spread out across the pavement. Nuclear crisis: Fukushima's legacy of fear 2012-03-07T18:20:26.903Z A statement issued by the utility, known as Tepco, said the suspension was prompted by a faster than expected rise in radiation in a part of the system intended to absorb caesium. Radiation spike halts work at Japan nuclear plant 2011-06-19T02:22:17Z Increasing numbers of cows have been found to have consumed rice straw containing high levels of radioactive caesium. Japan plans to ban Fukushima beef 2011-07-18T06:42:36Z But the accuracy of caesium clocks has introduced a potentially disastrous glitch into the world's timekeeping. The element that redefined time 2014-10-03T04:00:00Z The accident left thousands of tonnes of water laced with radioactive caesium-137 swilling around in the reactor's basement. Nuclear accident: Fukushima set for epic clean-up 2011-04-13T17:20:32.613Z Greenpeace says that a March field investigation in parts of Ukraine outside the Zone shows contamination from caesium-137 persisting in milk products, mushroom and berries. Postcard from Chernobyl: vision of Apocalypse 2011-04-11T07:58:15Z The extent of caesium-137 contamination at Fukushima is not yet clear, but available data indicate very high levels in some areas. A long shadow over Fukushima 2011-04-06T17:20:04.033Z Iodine is less of a problem because it starts to dissipate over a few days, but the risk posed by caesium will last far longer. Ruined livelihoods? 2011-03-30T17:13:26Z That year, the official international standard second was redefined based on the caesium transition. The element that redefined time 2014-10-03T04:00:00Z The zeolite removed the caesium and other radioisotopes, leaving almost pristine water, which was eventually evaporated at a facility on the site. Nuclear accident: Fukushima set for epic clean-up 2011-04-13T17:20:32.613Z If areas of Japan are significantly contaminated with radioactive caesium-137, which loses half its radioactivity in 30 years, the government may have to maintain an exclusion zone for decades. Chernobyl's legacy 2011-03-30T17:20:47.317Z Detailed maps of caesium-137 distribution would help to identify hotspots where people need to be evacuated urgently, he adds. Nuclear power: Radioactivity spreads in Japan 2011-03-30T17:20:34.827Z While the government and many experts play down comparisons with Chernobyl, the radioactive substances being emitted are the same -- iodine-131, caesium-134 and caesium-137. France, U.S. to help Japan in nuclear crisis 2011-03-30T00:28:06Z It was here in the 1930s that the physicist Louis Essen developed the first quartz ring clock, the most accurate timepiece of its day, and a precursor of the caesium clock. The element that redefined time 2014-10-03T04:00:00Z The water can be put through an ion exchange system to take out radionuclides like caesium. Long game 2011-03-29T12:51:34Z Nuclear accidents produce a spectrum of radioactive fission products, including various radioisotopes of iodine, caesium and zirconium. Radiation Data from Japanese Disaster Starts to Filter out 2011-03-18T16:45:11.967Z One factor that has yet to be explained is the apparent detection of radioactive isotopes of caesium. Japan's nuclear picture unclear 2011-03-12T13:44:17Z According to experts, the types of radioactive isotopes that might still be active in the Bryansk area include strontium 90 and caesium 137. Few Chernobyl radiation risks from Russia fires 2010-08-12T14:23:00Z What caesium has done is to raise the standards for the measurement of time exponentially. The element that redefined time 2014-10-03T04:00:00Z "The caesium is removed and put in a shielded container and sent to a repository." Long game 2011-03-29T12:51:34Z Thus, in 1967, SI adopted a more precise definition based on the frequency of the radiation a caesium atom emits when it flips between two energy states. 2010-01-15T08:50:00Z Rubidium, caesium, thallium, indium and gallium were first discovered by means of this instrument; the study of the rare earths is greatly facilitated, and the composition of the heavenly bodies alone determinable by it. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" France's Institute for Radiation Protection said there may be a slight increase in radioactivity in the nearby environment due to re-suspension of caesium-137, "but it would be very much lower than the natural radioactivity." Few Chernobyl radiation risks from Russia fires 2010-08-12T14:23:00Z He explains that the careful packaging is necessary because caesium is an alkali metal, from the first column of the periodic table. The element that redefined time 2014-10-03T04:00:00Z It led Bunsen himself almost immediately to the isolation of two new elements of the alkali group, caesium and rubidium. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Like caesium, it is precipitated with platinic chloride, and in the ordinary course of work would be weighed as potassium. A Text-book of Assaying: For the Use of Those Connected with Mines. Now, if you could watch inside you would see it change; it is now rubidium, now silver, now caesium. Master Tales of Mystery, Volume 3 We see, also, that caesium causes inflection, and rubidium does not; and these two metals are allied to sodium and potassium. Insectivorous Plants Szymaniec explains it works by using a series of lasers to push a group of caesium atoms so tightly together that they almost stop vibrating, dropping their temperature to a smidgen above absolute zero. The element that redefined time 2014-10-03T04:00:00Z The platino-chlorides are reduced by hydrogen, and the caesium and rubidium chlorides extracted by water. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" It's because this transition frequency is so much higher than the resonant frequency of quartz that a caesium clock is so much more accurate. The element that redefined time 2014-10-03T04:00:00Z But what does all this have to do with caesium, you are probably asking yourself? The element that redefined time 2014-10-03T04:00:00Z Without the caesium clock, for example, satellite navigation would be impossible. The element that redefined time 2014-10-03T04:00:00Z What the machine does next is tune a beam of microwave radiation into the resonant frequency of the caesium. The element that redefined time 2014-10-03T04:00:00Z Caesium nitrate, CsNO3, is obtained by dissolving the carbonate in nitric acid, and crystallizes in glittering prisms, which melt readily, and on heating evolve oxygen and leave a residue of caesium nitrite. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Being in column one means that caesium has a single electron in its outer shell. The element that redefined time 2014-10-03T04:00:00Z According to R. Bunsen, the best source of rubidium and caesium salts is the residue left after extraction of lithium salts from lepidolite. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" This residue consists of sodium, potassium and lithium chlorides, with small quantities of caesium and rubidium chlorides. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Just like champagne glasses and bridges, when you hit the right frequency the caesium gets excited, and what happens is that outermost electron jumps into a wider orbit. The element that redefined time 2014-10-03T04:00:00Z The separation of caesium from the minerals which contain it is an exceedingly difficult and laborious process. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" In order to separate caesium from rubidium, use is made of the different solubilities of their various salts. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" The atomic weight of caesium has been determined by the analysis of its chloride and bromide. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Caesium chloride, CsCl, is obtained by the direct action of chlorine on caesium, or by solution of the hydroxide in hydrochloric acid. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" |
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